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Questions tagged [flutter-change-notifier]

189 questions
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when I am calling the provider in the inistate return data got null

My question is.......When the app Started(initial start) circular progress indicator appears & didn't got any data.....My app has 3 tabs(using tabbar), but when I swicth between my tabs & when I came to the Home tab now I got the data & ui render…
Imesh Madushanka
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Flutter error- _InheritedProviderScope(value: Instance of 'Provider', listening to value)

I am currently working with an app in Flutter and I am using Provider for state management. I am using ChangeNotifierProvider of . AvProvider is a Class as class AvProvider extends ChangeNotifier to open a time picker to select time using Methods…
Lin
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How to use method from one Change notifier class in another change notifier class provider

I want to use fetchdata() in another provider method and initialise variables.
Tarun siva sai
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Create ListView with infinite scrolling by provider: setState() or markNeedsBuild() called during build

I am trying to create ListView where items are built while the screen is being scrolled. I am trying to add content by using provider. I get an error "setState() or markNeedsBuild() called during build" when calling notifyListener() inside…
Kouta Nakano
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How can I implement Sign Up/Login logic with Provider. Flutter, Dart, Mobile Development

Let' say I have three files: main.dart, LoginScreen.dart, HomePageScreen.dart. I am utilizing Provider architecture for state management and wrapping MaterialApp. When the app startup, the main.dart file checks whether the user is already Logged in…
XYZ
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Flutter ChangeNotifierProvider issue

I have a ProperyListPage and on each list item clicked this is the action it does. Navigator.push( context, MaterialPageRoute( builder: (context) => ChangeNotifierProvider.value( value: property, child:…
blupointmedia
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how can i create drowdownbutton with Riverpod Notifier?

I want to create DropDownButton with changenotifierProvider in Riverpod, but i can not write nicely my code. Please help me. I suppose, i just wrote 'watch' method, but i do not know how to read it. So, it should show the item which is chosen, and…
coldasspirit
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Try to read data from a class but returns null instead of its actual value - using Flutter Provider

I have the following problem. I want to read a variable from class1. The command to read the variable comes from another class. However it returns null. This is not my actual code, however I wrote a demo app to illustrate the problem: when I press a…
strato_cruiser
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When we use notifyListeners in ChangeNotifier?

Why we use sometimes notifyListeners and also why we do not use notifyListeners? How can we use a function in changenotifier ? For instance, in this code, sometimes we used to notifyListeners, but sometimes we did not use notifyListeners (in login()…
coldasspirit
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Flutter: Widget does not change dynamically on Tap

I want to dynamically change the screen with isUserRegistered of model. If isUserRegistered is True, I wanna show Icon which sets isUserRegistered to false when clicked. If isUserRegistered is False, I wanna hide Icon. I tried to use setState, but…
Naoki Oshiumi
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Can write userData to Firebase, Can't read from Firebase into fields : Flutter

I'm trying to read my UserData into form fields when the user tried to edit their information. I can write to Firebase, but I can't read and display user data into the built fields. Each userData is stored with the signed in user's mid as the…
hermie_brown
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Update a dependent ChangeNotifierProvider from another independent StreamProvider's response in Flutter

I was initially developing my app with simple change notifier providers. Later I decided to use Firestore and StreamProvider. Now I have a stream that returns a list. I want to populate my list in the Change Notifier after getting data from the…
Sebastian Gomes
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Calling notifyListeners() causes errors when called in deactivate() - Flutter

I have read all the questions related to this issue, but neither of them is similar to mine. I have two pages: homepage and settings page. In the homepage, I listen to changes of provider with Consumer. In the settings page, I don't listen to…
Tugay
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ChangeNotifierProvider between different pages

I've been searched but I didn't find any question (sorry If I there is some yet...) My question is: I have two pages, I use ChangeNotifierProvider in this two pages, but when I change a value in the second page and go back to the first page, the…
Jorge Perez Linares
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How to use providers to load data before consuming

In my application I use provider in the following manner; I create the schedule view like this; await Navigator.of(context, rootNavigator: true).push( MaterialPageRoute( builder: (BuildContext context) => …
Janaka
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